Tenanted child releases can deadlock due to the task cap

[markryd]

If you kick off a tenanted deployment with the same number of tenants as your task cap, and that deployment has a tenanted child deployment, the parent deployments deadlock because there isn't a spare slot in the task cap to run the child deployments.

We need to exclude waiting parent deployments from the task cap count.

[markryd]

Release Note: Prevent child releases to many tenants exhausting the task cap

[lock]

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